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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        Promise.resolve()
            .then(res => {
                console.log(res);
                return 2;
            })
            .catch(err => {
                return 3;
            })
            .then(res => {
                console.log(res);
            });
        let p1 = new Promise((resolve, rejected) => {
            resolve(1)
        })
        console.log(p1.then(res => {
            console.log(res);
            return 2; //不管是return 还是不resolve 状态都会变为resolve
        }));

        // .then(res => {
        //     console.log(res);
        // })

    </script>
</body>

</html>